Fastening pulling machine



April 1941- A. s. JOHNSON 2,238,978

FASTENING PULLING MACHINE Filed July 13, 1940 as Az Patented Apr. 22, 1941 United Shoe Machinery Corporation, Borough of Flemington, N. J., a corporation of New Jersey Application July 13, 1940, Serial No. 345,343

Claims.

This invention relates to fastening pulling machines and is herein illustrated as embodied in a machine particularly adapted for removing lasting tacks from shoes.

Machines commonly used in shoe factories for pulling lasting tacks from shoes comprise a claw tool movable in an orbital path, and a work restagainst which the shoe is positioned in presenting a track therein to the pulling tool. The work rest usually comprises a guard which extends underneath the tool along a portion of its path for the purpose of preventing the tool from digging into the shoe. One difiiculty, which has been experienced in connection with such machines, is that occasionally a tack removed by the tool becomes lodged between the tool and the guard, and the tool will exert sufiicient force upon the tack to cause breakage of the guard, the end portion of which is usually comparatively thin in order that the tool can closely approach the work to engage deeply embedded tacks.

In view of the foregoing, it is an object of the present invention to provide an improved tack pulling machine in which there is a guard so constructed as to eliminate likelihood of its breakage.

To this end and as shown, I have provided, in a machine of the type referred to, a guard which extends along a portion of the path of an oscillating tool, and has a yielding portion which is arranged for movement away from the tool when an obstruction occurs between the tool and the guard.

These and other features of the invention are disclosed in the accompanying drawing and the following specification, and are pointed out in the claims.

In the drawing,

Fig. 1 is a view in side elevation of a portion of a tack pulling machine embodying my invention;

Fig. 2 is a front view of the work rest and guard;

Fig. 3 is a plan view partly in section of the work rest and guard; and

Fig. 4 is a detail view in side elevation illustrating the operation of the guard.

As shown in Fig. 1, the tack pulling machine comprises a hollow head It) carrying a tack puller bar l2, mounted for oscillation upon a depending link I4, and having secured to its outer end portion a claw-shaped tack pulling tool Hi. The tack pulling tool is moved continuously in an orbital path by any convenient means, such as that illustrated in United States Letters Patent No. 1,807,853, granted June 2,

1931 upon application of F. L. MacKenzie, to which reference may be had for details of construction and operation of the machine thus far described.

For locating work relatively to the tool and forpreventing injury to the operator and the work, the machine is provided with a combined workrest and guard 18, which comprises a shank 20 adjustably mounted in the head It! by means ofzaj'bolt 22,-extending through a slot 24 in the head by which the bar maybe positioned in any desired location heightwise of the path of the tool IS. The shank 20 has integral therewith two vertically extending guard portions 26 and 28, which are positioned upon opposite sides of the path of the tool, thereby preventing ready access to the tool laterally thereof, thus to reduce likelihood of injury to the work or to the operator. The portion 26 is in the form of a plate, the underside of which serves as a work rest against which the bottom of a shoe can be positioned in locating tacks therein in operative relation to the tool. The forward portion of the plate 26 is curved upwardly to permit tilting of the shoe about a point adjacent to the end of the tool in its tack pulling position to provide for the presentation to the tool of a deeply embedded tack. The guard portions 26 and 28 are connected by a laterally extending inclined projection 30 located below the end of the tack puller bar [2.

To provide for protection against the tool digging into the work presented thereto, I have provided a guard 32 in the form of a plate positioned beneath the tool l6 adjacent to the inner end of the path of movement of the tool. The guard 32 has ears 34 mounted on a pin 36, carried by a rearward extension 38 of the work rest l8. The forward portion of the guard 32 is beveled, as indicated at 40, to permit passage of the tool across the plate, the extreme forward edge portion of the guard being comparatively thin in order to permit close approach of the bottom of the shoe to the tool, as is necessary in order to engage the head of a deeply driven tack. There is provided a spring 42, located between the rearward extension 38 and bearing upon a tail portion 44 of the guard to force the same in a. clockwise direction into engagement with the underside of the extension, thus normally to maintain the guard 32 in operative position with its forward portion forming a continuation of the projection 30, while at the same time providing for a yielding of the guard in a direction away from the path of the tool.

is thrown into such position thatitlodges between the tool and the guard 32, the-latter will yield, as shown in Fig. 4, thus avoiding any likelihood of breakage of the nose portion of the guard. Upon the next cycle of movement of the a tool, the tack, which is lodged in the position shown, will be pushed away, and the guard plate will be returned by the spring 42 to its normal position.

Having described my invention, what I claim as new and desire to secure by Letters Patent of the United States is: I

1. A fastening pulling machine comprising a 1 tool movable in an orbital path, a work rest having a portion thereof extending along the path of the tool, and a guard positioned beneathcthe path of the tool and mounted upon the work rest for movement away from the tool upon the occurrence of an obstruction between the tool and the guard. 7 i

2. A fastening pulling machine comprising (a tool movablein an orbital path, a work rest extending adjacent to the path of the tool, a guard member extending beneath the path of the tool and comprising a plate pivotally mounted upon the work rest for movement toward and away from the tool, and a spring fornormally forcing the plate in a direction toward the tool.

3. A fastening pulling machine comprising a tack pulling tool movable in an orbital path, a work rest located adjacent to the path of the tooland having a portion extending beneath the path of the tool, and a guard member forming a continuation of said portion and pivotally mounted thereon for movement in a direction away-from the path of the tool when anobstruction occurs between the tool and the guard member.

4. A fastening pulling machine comprising a fastening pulling tool movable in an orbital path, a work rest adjacent to the path of the tool, and a' guard yieldably mounted upon the work rest and extending along a portion of the path of the tool.

5. A fastening pulling machine comprising a fastening-pulling tool movable in an orbital path, a work rest adjacent to the path of the tool, guard members carried by thework rest and positioned ,upon opposite sides of thepath of the tool, a

guard member located beneath a portion of the path of the tool, and means for yieldably mounting the last-mentioned guard member on the work rest for movement away from the tool.

ARTHUR s. JOHNSON. 

